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| 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
| 4 | 4 |
| 5 part of serialization; | 5 part of serialization; |
| 6 | 6 |
| 7 /** | 7 /** |
| 8 * This writes out the state of the objects to an external format. It holds | 8 * This writes out the state of the objects to an external format. It holds |
| 9 * all of the intermediate state needed. The primary API for it is the | 9 * all of the intermediate state needed. The primary API for it is the |
| 10 * [write] method. | 10 * [write] method. |
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| 204 * no reference, return the object itself. Once we have finished the tracing | 204 * no reference, return the object itself. Once we have finished the tracing |
| 205 * step, all objects that should have a reference (roughly speaking, | 205 * step, all objects that should have a reference (roughly speaking, |
| 206 * non-primitives) can be relied on to have a reference. | 206 * non-primitives) can be relied on to have a reference. |
| 207 */ | 207 */ |
| 208 _referenceFor(object) { | 208 _referenceFor(object) { |
| 209 var result = references[object]; | 209 var result = references[object]; |
| 210 return (result == null) ? object : result; | 210 return (result == null) ? object : result; |
| 211 } | 211 } |
| 212 | 212 |
| 213 /** | 213 /** |
| 214 * Return true if the [namedObjects] collection has a reference to [object]. | 214 * Return true if the [Serialization.namedObjects] collection has a |
| 215 * reference to [object]. |
| 215 */ | 216 */ |
| 216 // TODO(alanknight): Should the writer also have its own namedObjects | 217 // TODO(alanknight): Should the writer also have its own namedObjects |
| 217 // collection specific to the particular write, or is that just adding | 218 // collection specific to the particular write, or is that just adding |
| 218 // complexity for little value? | 219 // complexity for little value? |
| 219 hasNameFor(object) => serialization._hasNameFor(object); | 220 hasNameFor(object) => serialization._hasNameFor(object); |
| 220 | 221 |
| 221 /** | 222 /** |
| 222 * Return the name we have for this object in the [namedObjects] collection. | 223 * Return the name we have for this object in the [Serialization.namedObjects] |
| 224 * collection. |
| 223 */ | 225 */ |
| 224 nameFor(object) => serialization._nameFor(object); | 226 nameFor(object) => serialization._nameFor(object); |
| 225 | 227 |
| 226 // For debugging/testing purposes. Find what state a reference points to. | 228 // For debugging/testing purposes. Find what state a reference points to. |
| 227 stateForReference(Reference r) => states[r.ruleNumber][r.objectNumber]; | 229 stateForReference(Reference r) => states[r.ruleNumber][r.objectNumber]; |
| 228 | 230 |
| 229 /** Return the state pointed to by [reference]. */ | 231 /** Return the state pointed to by [reference]. */ |
| 230 resolveReference(reference) => stateForReference(reference); | 232 resolveReference(reference) => stateForReference(reference); |
| 231 } | 233 } |
| 232 | 234 |
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| 271 * Each rule has a number, and rules keep track of the objects that they | 273 * Each rule has a number, and rules keep track of the objects that they |
| 272 * serialize, in order. So the state of any object can be found by indexing | 274 * serialize, in order. So the state of any object can be found by indexing |
| 273 * from the rule number and the object number within the rule. | 275 * from the rule number and the object number within the rule. |
| 274 * The actual representation of the state is determined by the rule. Lists | 276 * The actual representation of the state is determined by the rule. Lists |
| 275 * and Maps are common, but it is arbitrary. See [Writer.states]. | 277 * and Maps are common, but it is arbitrary. See [Writer.states]. |
| 276 */ | 278 */ |
| 277 List<List> _data; | 279 List<List> _data; |
| 278 | 280 |
| 279 /** | 281 /** |
| 280 * The resulting objects, indexed according to the same scheme as | 282 * The resulting objects, indexed according to the same scheme as |
| 281 * [data], where each rule has a number, and rules keep track of the objects | 283 * _data, where each rule has a number, and rules keep track of the objects |
| 282 * that they serialize, in order. | 284 * that they serialize, in order. |
| 283 */ | 285 */ |
| 284 List<List> objects; | 286 List<List> objects; |
| 285 | 287 |
| 286 Format format = new SimpleMapFormat(); | 288 Format format = new SimpleMapFormat(); |
| 287 | 289 |
| 288 /** | 290 /** |
| 289 * Creates a new [Reader] that uses the rules from its parent | 291 * Creates a new [Reader] that uses the rules from its parent |
| 290 * [Serialization]. Serializations do not keep any state related to | 292 * [Serialization]. Serializations do not keep any state related to |
| 291 * a particular read or write operation, so the same one can be used | 293 * a particular read or write operation, so the same one can be used |
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| 572 /** | 574 /** |
| 573 * Return the thing this reference points to. Assumes that we have a valid | 575 * Return the thing this reference points to. Assumes that we have a valid |
| 574 * parent and that it is a Reader, as inflating is not meaningful when | 576 * parent and that it is a Reader, as inflating is not meaningful when |
| 575 * writing. | 577 * writing. |
| 576 */ | 578 */ |
| 577 inflated() => parent.resolveReference(this); | 579 inflated() => parent.resolveReference(this); |
| 578 | 580 |
| 579 /** | 581 /** |
| 580 * Convert the reference to a map in JSON format. This is specific to the | 582 * Convert the reference to a map in JSON format. This is specific to the |
| 581 * custom JSON format we define, and must be consistent with the | 583 * custom JSON format we define, and must be consistent with the |
| 582 * [asReference] method. | 584 * [Reader.asReference] method. |
| 583 */ | 585 */ |
| 584 // TODO(alanknight): This is a hack both in defining a toJson specific to a | 586 // TODO(alanknight): This is a hack both in defining a toJson specific to a |
| 585 // particular representation, and the use of a bogus sentinel "__Ref" | 587 // particular representation, and the use of a bogus sentinel "__Ref" |
| 586 toJson() => { | 588 toJson() => { |
| 587 "__Ref" : true, | 589 "__Ref" : true, |
| 588 "rule" : ruleNumber, | 590 "rule" : ruleNumber, |
| 589 "object" : objectNumber | 591 "object" : objectNumber |
| 590 }; | 592 }; |
| 591 | 593 |
| 592 /** Write our information to [list]. Useful in writing to flat formats.*/ | 594 /** Write our information to [list]. Useful in writing to flat formats.*/ |
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| 606 * for an example. It knows how to return its object and how to filter. | 608 * for an example. It knows how to return its object and how to filter. |
| 607 */ | 609 */ |
| 608 class DesignatedRuleForObject { | 610 class DesignatedRuleForObject { |
| 609 Function rulePredicate; | 611 Function rulePredicate; |
| 610 final target; | 612 final target; |
| 611 | 613 |
| 612 DesignatedRuleForObject(this.target, this.rulePredicate); | 614 DesignatedRuleForObject(this.target, this.rulePredicate); |
| 613 | 615 |
| 614 possibleRules(List rules) => rules.where(rulePredicate).toList(); | 616 possibleRules(List rules) => rules.where(rulePredicate).toList(); |
| 615 } | 617 } |
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